Carbon dioxide foaming of glassy polymers


Wessling, M. and Borneman, Z. and Boomgaard, Th. van den and Smolders, C.A. (1994) Carbon dioxide foaming of glassy polymers. Journal of applied polymer science, 53 (11). pp. 1497-1512. ISSN 0021-8995

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Abstract:The mechanism of foaming a glassy polymer using sorbed carbon dioxide is studied in detail. A glassy polymer supersaturated with nitrogen forms a microcellular foam, if the polymer is quickly heated above its glass transition temperature. A glassy polymer supersaturated with CO2 forms this foam-like structure at much lower temperatures which indicates the Tg-depressing effect of CO2. Having this interpretation in mind, the overall sample morphology, i.e., a porous foam enclosed by dense outer skins, can be completely explained. The dense skins, however, are not homogeneous but show a nodular structure when analyzed by SEM and AFM. Foaming experiments with samples having a different thermal history suggest that the nucleation mechanism underlying the foaming process is heterogeneous in nature
Item Type:Article
Copyright:© 1994 John Wiley & Sons, Inc.
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